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<p>Reports invalid definitions and usages of protocols introduced in
  <a href="https://www.python.org/dev/peps/pep-0544/">PEP-544</a>.</p>
<p><b>Example:</b></p>
<pre><code>
from typing import Protocol


class MyProtocol(Protocol):
    def method(self, p: int) -> str:
        pass


class MyClass(MyProtocol):
    def method(self, p: str) -> int: # Type of 'method' is not compatible with 'MyProtocol'
        pass


class MyAnotherProtocol(MyClass, Protocol): # All bases of a protocol must be protocols
    pass

</code></pre>
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